Cellerator is a similar program,
that also converts reactions to odes, implemented by the
same team of developers. It is not as general as xlr8r, and
less efficient. Cellerator has a more restrictive use and
distribution license.

Development of
xCellerator was supported in part by the US National Science
Foundation Frontiers in Integrative Biological Resarch Grant
0330786; and by the Beckman Institute at the California
Institute of Technology. xCellerator™, Cellerator™,
xlr8r™, cellzilla™, growzilla™ and
arrowzilla™ are trademarks of the authors and may not be
used without permission. Cellerator and Cellerator based
technology is protected under United States Patent Number
7,319,945.